The reaction of substituted arylidenemalononitriles and 3-methyl-1-phenyl-2-pyrazolin- 5-one in DMF in the presence of KF-montmorillonite provides a rapid synthesis of 3-methyl-6-amino -5-cyano-4-aryl-1-phenyl-1,4-dihydro- pyrano[2,3-c]pyrazole derivatives. ... Keywords: 1,4-dihydropyrano[2,3-c]pyrazole, KF-montmorillonite, synthesis, 4H-pyran ... 4H-Pyran derivatives are important building blocks for many natural compounds1-4 with anti-allergic5 and anti- ...
![Propanedinitrile,2-[(4-nitrophenyl)methylene]- Structure](https://image.chemsrc.com/caspic/112/2700-23-4.png)
![6-amino-3-methyl-4-(4-nitrophenyl)-1-phenyl-4H-pyrano[2,3-c]pyrazole-5-carbonitrile Structure](https://image.chemsrc.com/caspic/222/76973-34-7.png)